Hi, We live in Catonsville and have a three year old plum tree in our yard, not sure of the variety, that has gotten brown spots on it's leaves that eventually kill the leaves and they fall off the past two years. We think it's bacterial leaf spot from an internet search last year and want to prevent it this year. I was planning to spray it with a liquid copper fungicide, but just read today that it should be used before the tree blossoms because it's toxic to bees. I'm wondering if I can do anything to prevent the leaf spot without harming the bees and maybe get a plum or two this year, so far we've had none. We had the same thing happen on our new Lilac bush too, the leaves all fell off from a brown curling leaf, but it's starting to bloom now, so I'm wondering if I should spray that as well?